Sharpen a Hole Punch

I've had the same hole punch for many years, maybe even since I was in college. As I start to use my hole punch for my Filofax pages, I've noticed it has become dull. It is frustrating when it no longer punches a clean hole and catches on the paper, leaving the edges ragged. After a quick google search I discovered that you can easily sharpen your hole punches.

Items Needed:
Dull Hole Punch
Aluminum Foil
Paper to test

Instructions:
Clean your hole punch, pull off a piece of aluminum foil and punch holes in the foil several times. Once completed  test the sharpness on paper, if needed repunch the foil.